/*
 * Copyright (c) 2013, OpenCloudDB/MyCAT and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software;Designed and Developed mainly by many Chinese 
 * opensource volunteers. you can redistribute it and/or modify it under the 
 * terms of the GNU General Public License version 2 only, as published by the
 * Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 * 
 * Any questions about this component can be directed to it's project Web address 
 * https://code.google.com/p/opencloudb/.
 *
 */
package io.mycat.server.response;

import io.mycat.MycatServer;
import io.mycat.server.ErrorCode;
import io.mycat.server.MySQLFrontConnection;
import io.mycat.server.packet.ErrorPacket;
import io.mycat.server.packet.HeartbeatPacket;
import io.mycat.server.packet.OkPacket;
import io.mycat.util.TimeUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author mycat
 */
public class Heartbeat {

	public static final Logger HEARTBEAT = LoggerFactory
			.getLogger("heartbeat");

	public static void response(MySQLFrontConnection c, byte[] data) {
		HeartbeatPacket hp = new HeartbeatPacket();
		hp.read(data);
		if (MycatServer.getInstance().isOnline()) {
			OkPacket ok = new OkPacket();
			ok.packetId = 1;
			ok.affectedRows = hp.id;
			ok.serverStatus = 2;
			ok.write(c);
			if (HEARTBEAT.isInfoEnabled()) {
				HEARTBEAT.info(responseMessage("OK", c, hp.id));
			}
		} else {
			ErrorPacket error = new ErrorPacket();
			error.packetId = 1;
			error.errno = ErrorCode.ER_SERVER_SHUTDOWN;
			error.message = String.valueOf(hp.id).getBytes();
			error.write(c);
			if (HEARTBEAT.isInfoEnabled()) {
				HEARTBEAT.info(responseMessage("ERROR", c, hp.id));
			}
		}
	}

	private static String responseMessage(String action,
			MySQLFrontConnection c, long id) {
		return new StringBuilder("RESPONSE:").append(action).append(", id=")
				.append(id).append(", host=").append(c.getHost())
				.append(", port=").append(c.getPort()).append(", time=")
				.append(TimeUtil.currentTimeMillis()).toString();
	}

}